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In the majority, if not all cases, mac_interface and phy_interface are the same with the exception of some drivers that I have suggested only use phy_interface and set mac_interface to PHY_INTERFACE_MODE_NA. The only two that currently set mac_interface to PHY_INTERFACE_MODE_NA are dwmac-loongson and dwmac-lpc18xx, neither of which use RGMII nor SGMII. In order to phase out the use of mac_interface, we need to have a path for existing drivers so they can update to only using phy_interface without causing regressions. Therefore, in order to keep the "pcs" code working, we need to choose the STMMAC integrated PCS mode based on phy_interface if mac_interface is PHY_INTERFACE_MODE_NA. This will allow more drivers to set mac_interface to PHY_INTERFACE_MODE_NA without risking regressions. Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> Link: https://patch.msgid.link/E1uytpG-00000006H29-1Ltk@rmk-PC.armlinux.org.uk Signed-off-by: Jakub Kicinski <kuba@kernel.org>